Dental General 5e1efc01 Which of the following crystal form is least found in calculus: A Hydroxyapatite. B Magnesium whitlockite. C Octacalcium phosphate. D Brushite. High-Yield Explanation Hydroxyapatite 58% Magnesium whitlockite 21% Octacalcium phosphate 21% Brushite 9%